Three women are walking the length of the River Thames to raise money for a children's cancer charity.
Funds raised will go to the International Retinoblastoma Daisy Fund (IRDF) which supports families of children affected by retinoblastoma.
Retinoblastoma is a rare, fast growing eye cancer of early childhood.
The group began the walk at the Thames Barrier on 30 April and will finish at Kemble on 15 May. On Tuesday they are walking from Culham to Oxford.
Abby White, who survived retinoblastoma in both eyes as a child, is walking with her mother, Francine, and friend, Joy High.
"Children diagnosed with (retinoblastoma) require treatment by specially trained doctors because of the rarity of this cancer," said Ms White.
"It shouldn't matter where they live in the world. Access to good healthcare is a basic human right, and children should not be allowed to die from an entirely treatable cancer."